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Martin Hope
rost
Asked: 2024-09-16 19:02:44 +0000 UTC
  • 5

事实是，我不小心将 MBR 转换为 GPT，现在我有了一个没有分区的半活磁盘。 Arch Linux LiveUSB 仅在紧急模式下启动，在此模式下没有包管理器或 fdisk 或 pared 等实用程序。如何通过 Arch Linux Live USB 紧急模式再次将 MBR 替换为 GPT？还有其他方法吗？我尝试了win10启动U盘，但提示磁盘错误。

archlinux
Martin Hope
rost
Asked: 2024-08-21 10:36:48 +0000 UTC
  • 5

如何将终端的全部内容复制到一行中，以便我可以对此内容执行某些操作并将更改的内容粘贴到终端中？如果问题不完全清楚，那么代码可能如下所示：

#include <iostream>
#include <string>
#include <stdlib.h>

int main() {
    std::string consoleInsd = get_console(); // тут нужно получить содержимое консоли
    int lenght = consoleInsd.length();
    consoleInsd = consoleInsd.substr(0, length - 10); // для примера хочу убрать последние 10 символов
    system("clear");
    std::cout << consoleInsd;

    return 0;
}
c++
Martin Hope
rost
Asked: 2024-08-09 04:35:33 +0000 UTC
  • 6

我决定尝试在没有库的情况下编写图形（我自己的总是更清晰），但启动后我没有找到任何东西，我决定将图形放大 - 它仍然没有帮助。没有显示任何错误，程序只是启动，仅此而已。 FrameBuffer 的路径似乎是正确的。 （忽略非终止 while 循环，这是一个临时存根）

代码：

#include <iostream>
#include <string>
#include <vector>
#include <unistd.h>
#include <sys/ioctl.h>
#include <linux/fb.h>
#include <fcntl.h>
#include <sys/mman.h>

const int SCREEN_WIDTH = 800;
const int SCREEN_HEIGHT = 600;

const std::vector<float> vertices = {
    -0.5f, -0.5f, 0.0f,
     0.5f, -0.5f, 0.0f,
     0.0f,  0.5f, 0.0f
};

const std::vector<float> colors = {
    1.0f, 0.5f, 0.75f,
    1.0f, 0.5f, 0.75f,
    1.0f, 0.5f, 0.75f
};

int main() {
    int fb_fd = open("/dev/fb0", O_RDWR);
    if (fb_fd < 0) {
        std::cerr << "Failed to open framebuffer" << std::endl;
        return 1;
    }

    struct fb_var_screeninfo vinfo;
    ioctl(fb_fd, FBIOGET_HWCINFO, &vinfo);

    unsigned char* fbp = (unsigned char*)mmap(0, vinfo.xres * vinfo.yres * (vinfo.bits_per_pixel / 8), PROT_READ | PROT_WRITE, MAP_SHARED, fb_fd, 0);
    if (fbp == MAP_FAILED) {
        std::cerr << "Failed to map framebuffer" << std::endl;
        close(fb_fd);
        return 1;
    }
    while (true) {

        for (int y = 0; y < SCREEN_HEIGHT; y++) {
            for (int x = 0; x < SCREEN_WIDTH; x++) {
                bool inside = false;
                for (int i = 0; i < vertices.size(); i += 3) {
                    float x1 = vertices[i] * SCREEN_WIDTH / 2 + SCREEN_WIDTH / 2;
                    float y1 = vertices[i+1] * SCREEN_HEIGHT / 2 + SCREEN_HEIGHT / 2;
                    float x2 = vertices[i+3] * SCREEN_WIDTH / 2 + SCREEN_WIDTH / 2;
                    float y2 = vertices[i+4] * SCREEN_HEIGHT / 2 + SCREEN_HEIGHT / 2;
                    float x3 = vertices[i+6] * SCREEN_WIDTH / 2 + SCREEN_WIDTH / 2;
                    float y3 = vertices[i+7] * SCREEN_HEIGHT / 2 + SCREEN_HEIGHT / 2;

                    if ((x - x1) * (y2 - y1) - (y - y1) * (x2 - x1) >= 0 &&
                        (x - x2) * (y3 - y2) - (y - y2) * (x3 - x2) >= 0 &&
                        (x - x3) * (y1 - y3) - (y - y3) * (x1 - x3) >= 0) {
                        inside = true;
                        break;
                    }
                }

                if (inside) {
                    int pixel_offset = (y * vinfo.xres + x) * (vinfo.bits_per_pixel / 8);
                    fbp[pixel_offset + 0] = static_cast<unsigned char>(colors[2] * 255);
                    fbp[pixel_offset + 1] = static_cast<unsigned char>(colors[1] * 255);
                    fbp[pixel_offset + 2] = static_cast<unsigned char>(colors[0] * 255);
                }
            }
        }

        munmap(fbp, vinfo.xres * vinfo.yres * (vinfo.bits_per_pixel / 8));
    }
    close(fb_fd);
    return 0;
}

系统：

[rost@archlinux ~]$ neofetch
                   -`                    rost@archlinux 
                  .o+`                   -------------- 
                 `ooo/                   OS: Arch Linux x86_64 
                `+oooo:                  Host: 81HN Lenovo V130-15IKB 
               `+oooooo:                 Kernel: 6.9.7-arch1-1 
               -+oooooo+:                Uptime: 1 day, 1 hour, 15 mins 
             `/:-:++oooo+:               Packages: 1258 (pacman) 
            `/++++/+++++++:              Shell: bash 5.2.26 
           `/++++++++++++++:             Resolution: 1920x1080 
          `/+++ooooooooooooo/`           DE: Plasma 6.1.1 
         ./ooosssso++osssssso+`          WM: kwin 
        .oossssso-````/ossssss+`         Theme: Breeze-Dark [GTK2], Breeze [GTK3] 
       -osssssso.      :ssssssso.        Icons: breeze-dark [GTK2/3] 
      :osssssss/        osssso+++.       Terminal: konsole 
     /ossssssss/        +ssssooo/-       CPU: Intel i5-7200U (4) @ 3.100GHz 
   `/ossssso+/:-        -:/+osssso+-     GPU: Intel HD Graphics 620 
  `+sso+:-`                 `.-/+oso:    Memory: 5700MiB / 7107MiB 
 `++:.                           `-/+/
 .`                                 `/
c++
Martin Hope
rost
Asked: 2024-06-11 09:52:13 +0000 UTC
  • 5

我最终决定安装 Linux，并没有像许多人推荐的那样从 Ubuntu 开始，而是从 Arch 开始。安装完后，打开浏览器，发现没有网络。原来不是我，而是电脑本身。网络管理器未运行。如何在 Arch-Linux 上上网？嗯，这里是：lspci -v

Network controller: Intel Corporation Dual Band Wireless-AC 3165 Plus Bluetooth (Rev 99)
Subsystem: Intel Corporation Dual Band Wireless-AC 3165
Flags: bus master, fast devsel, latency 0, IRQ 133
Memory at f1100000 (64-bit, non-prefetchable) [size=8K]
Capabilities: denied
Kernel driver in use: r8169
Kernel modules: r8169

sudo systemctl 状态 systemd-networkd

Loaded: (source; enabled; preset: enabled)
Active: active (running)
TriggeredBy: systemd-networkd.socket
Status: "Processing requests..."
Tasks: 1 (limit: 8494)
FD Store: 0 (limit: 512)
Memory: 3.2M (peak: 3.5M)
CPU: 33ms

sudo systemctl 状态 systemd-resolved

Loaded: loaded (source: enabled; preset: enabled)
Active: active (running)
Status: "Processing requests..."
Tasks: 1 (limit: 8494)
Memory: 3.8M (peak: 3.9M)
CPU: 60ms
linux